Preparation of Diamond Nanofluids and Study of Lubrication Properties

As an emerging two-dimensional nanomaterial, diamond nanosheets have the advantages of high hardness and chemical stability; exhibiting good tribological properties when used as lubricant additives. However, the dispersion stability of nanomaterials as additives in lubricants remains a significant challenge. In this study, fluidized and functionalized diamond nanofluids were prepared by grafting polyether amine on the surface of diamond nanosheets. By changing the state of diamond nanosheets, this material not only improved its own lubrication property, but also improved its dispersion in the lubricant. The friction test results demonstrated that the friction coefficient was reduced by 66.9% and the wear rate was reduced by 81.8% with the addition of 3 wt% of diamond nanofluid in water-glycol solution. This enhancement of lubricating properties is related to the excellent film-forming properties of diamond nanofluids during the tribology. This indicates that fluidized 2D diamond nanosheets have excellent lubricating properties and can significantly improve the friction properties of lubricants as additives.